# Search for Neutrinos in Super-Kamiokande Associated with the GW170817 Neutron-star Merger

Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Iyogi, K, Kameda, J, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M
et al (show 153 more authors) (2018) Search for Neutrinos in Super-Kamiokande Associated with the GW170817 Neutron-star Merger. ASTROPHYSICAL JOURNAL LETTERS, 857 (1). L4-L4.

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## Abstract

We report the results of a neutrino search in Super-Kamiokande for coincident signals with the first detected gravitational wave produced by a binary neutron star merger, GW170817, which was followed by a short gamma-ray burst, GRB170817A, and a kilonova/macronova. We searched for coincident neutrino events in the range from 3.5 MeV to $\sim$100 PeV, in a time window $\pm$500 seconds around the gravitational wave detection time, as well as during a 14-day period after the detection. No significant neutrino signal was observed for either time window. We calculated 90% confidence level upper limits on the neutrino fluence for GW170817. From the upward-going-muon events in the energy region above 1.6 GeV, the neutrino fluence limit is $16.0^{+0.7}_{-0.6}$ ($21.3^{+1.1}_{-0.8}$) cm$^{-2}$ for muon neutrinos (muon antineutrinos), with an error range of $\pm5^{\circ}$ around the zenith angle of NGC4993, and the energy spectrum is under the assumption of an index of $-2$. The fluence limit for neutrino energies less than 100 MeV, for which the emission mechanism would be different than for higher-energy neutrinos, is also calculated. It is $6.6 \times 10^7$ cm$^{-2}$ for anti-electron neutrinos under the assumption of a Fermi-Dirac spectrum with average energy of 20 MeV.

Item Type: Article 8 pages, 4 figures astroparticle physics, gravitational waves, neutrinos Symplectic Admin 25 Jun 2018 06:31 19 Jan 2023 01:31 10.3847/2041-8213/aabaca http://iopscience.iop.org/article/10.3847/2041-821... https://livrepository.liverpool.ac.uk/id/eprint/3022999